1 /* 2 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.nodes.calc; 26 27 import org.graalvm.compiler.core.common.type.IntegerStamp; 28 import org.graalvm.compiler.core.common.type.Stamp; 29 import org.graalvm.compiler.graph.NodeClass; 30 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 31 import org.graalvm.compiler.nodeinfo.NodeInfo; 32 import org.graalvm.compiler.nodes.ConstantNode; 33 import org.graalvm.compiler.nodes.NodeView; 34 import org.graalvm.compiler.nodes.ValueNode; 35 import org.graalvm.compiler.nodes.extended.GuardingNode; 36 import org.graalvm.compiler.nodes.spi.LIRLowerable; 37 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 38 39 import jdk.vm.ci.code.CodeUtil; 40 41 @NodeInfo(shortName = "%") 42 public class SignedRemNode extends IntegerDivRemNode implements LIRLowerable { 43 44 public static final NodeClass<SignedRemNode> TYPE = NodeClass.create(SignedRemNode.class); 45 46 protected SignedRemNode(ValueNode x, ValueNode y, GuardingNode zeroCheck) { 47 this(TYPE, x, y, zeroCheck); 48 } 49 50 protected SignedRemNode(NodeClass<? extends SignedRemNode> c, ValueNode x, ValueNode y, GuardingNode zeroCheck) { 51 super(c, IntegerStamp.OPS.getRem().foldStamp(x.stamp(NodeView.DEFAULT), y.stamp(NodeView.DEFAULT)), Op.REM, Type.SIGNED, x, y, zeroCheck); 52 } 53 54 public static ValueNode create(ValueNode x, ValueNode y, GuardingNode zeroCheck, NodeView view) { 55 Stamp stamp = IntegerStamp.OPS.getRem().foldStamp(x.stamp(view), y.stamp(view)); 56 return canonical(null, x, y, zeroCheck, stamp, view); 57 } 58 59 @Override 60 public boolean inferStamp() { 61 return updateStamp(IntegerStamp.OPS.getRem().foldStamp(getX().stamp(NodeView.DEFAULT), getY().stamp(NodeView.DEFAULT))); 62 } 63 64 @Override 65 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) { 66 NodeView view = NodeView.from(tool); 67 return canonical(this, forX, forY, getZeroCheck(), stamp(view), view); 68 } 69 70 private static ValueNode canonical(SignedRemNode self, ValueNode forX, ValueNode forY, GuardingNode zeroCheck, Stamp stamp, NodeView view) { 71 if (forX.isConstant() && forY.isConstant()) { 72 long y = forY.asJavaConstant().asLong(); 73 if (y == 0) { 74 /* This will trap, cannot canonicalize. */ 75 return self != null ? self : new SignedRemNode(forX, forY, zeroCheck); 76 } 77 return ConstantNode.forIntegerStamp(stamp, forX.asJavaConstant().asLong() % y); 78 } else if (forY.isConstant() && forX.stamp(view) instanceof IntegerStamp && forY.stamp(view) instanceof IntegerStamp) { 79 long constY = forY.asJavaConstant().asLong(); 80 IntegerStamp xStamp = (IntegerStamp) forX.stamp(view); 81 IntegerStamp yStamp = (IntegerStamp) forY.stamp(view); 82 if (constY < 0 && constY != CodeUtil.minValue(yStamp.getBits())) { 83 Stamp newStamp = IntegerStamp.OPS.getRem().foldStamp(forX.stamp(view), forY.stamp(view)); 84 return canonical(null, forX, ConstantNode.forIntegerStamp(yStamp, -constY), zeroCheck, newStamp, view); 85 } 86 87 if (constY == 1) { 88 return ConstantNode.forIntegerStamp(stamp, 0); 89 } else if (CodeUtil.isPowerOf2(constY)) { 90 if (xStamp.isPositive()) { 91 // x & (y - 1) 92 return new AndNode(forX, ConstantNode.forIntegerStamp(stamp, constY - 1)); 93 } else if (xStamp.isNegative()) { 94 // -((-x) & (y - 1)) 95 return new NegateNode(new AndNode(new NegateNode(forX), ConstantNode.forIntegerStamp(stamp, constY - 1))); 96 } else { 97 // x - ((x / y) << log2(y)) 98 return SubNode.create(forX, LeftShiftNode.create(SignedDivNode.canonical(forX, constY, view), ConstantNode.forInt(CodeUtil.log2(constY)), view), view); 99 } 100 } 101 } 102 return self != null ? self : new SignedRemNode(forX, forY, zeroCheck); 103 } 104 105 @Override 106 public void generate(NodeLIRBuilderTool gen) { 107 gen.setResult(this, gen.getLIRGeneratorTool().getArithmetic().emitRem(gen.operand(getX()), gen.operand(getY()), gen.state(this))); 108 } 109 }